package com.gitee.cashzhang27.test.boot.activiti.controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Model;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

/**
 * ModelSaveRestResource.
 *
 * @author Cash Zhang
 * @version v1.0
 * @since 2019/04/12 11:34
 */
@Slf4j
@RestController
@AllArgsConstructor
public class ModelSaveRestResource implements ModelDataJsonConstants {

  private RepositoryService repositoryService;

  private ObjectMapper objectMapper;

  @PutMapping(value = "/model/{modelId}/save")
  @ResponseStatus(value = HttpStatus.OK)
  public void saveModel(
      @PathVariable String modelId,
      String name,
      String description,
      String json_xml,
      String svg_xml) {
    try {

      Model model = this.repositoryService.getModel(modelId);

      ObjectNode modelJson = (ObjectNode) this.objectMapper.readTree(model.getMetaInfo());

      modelJson.put(MODEL_NAME, name);
      modelJson.put(MODEL_DESCRIPTION, description);
      model.setMetaInfo(modelJson.toString());
      model.setName(name);

      this.repositoryService.saveModel(model);

      this.repositoryService.addModelEditorSource(
          model.getId(), json_xml.getBytes(StandardCharsets.UTF_8));

      InputStream svgStream = new ByteArrayInputStream(svg_xml.getBytes(StandardCharsets.UTF_8));
      TranscoderInput input = new TranscoderInput(svgStream);

      PNGTranscoder transcoder = new PNGTranscoder();
      // Setup output
      ByteArrayOutputStream outStream = new ByteArrayOutputStream();
      TranscoderOutput output = new TranscoderOutput(outStream);

      // Do the transformation
      transcoder.transcode(input, output);
      final byte[] result = outStream.toByteArray();
      this.repositoryService.addModelEditorSourceExtra(model.getId(), result);
      outStream.close();

    } catch (Exception e) {
      log.error("Error saving model", e);
      throw new ActivitiException("Error saving model", e);
    }
  }
}
